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generic_file_direct_write(): switch to iov_iter

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Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2014-03-03 22:03:20 -05:00
commit f8579f8673
6 changed files with 19 additions and 23 deletions
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15
mm/filemap.c
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@ -2385,9 +2385,8 @@ int pagecache_write_end(struct file *file, struct address_space *mapping,
EXPORT_SYMBOL(pagecache_write_end);
ssize_t
generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long *nr_segs, loff_t pos,
size_t count, size_t ocount)
generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
loff_t pos, size_t count, size_t ocount)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@ -2397,9 +2396,9 @@ generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
pgoff_t end;
if (count != ocount)
*nr_segs = iov_shorten((struct iovec *)iov, *nr_segs, count);
from->nr_segs = iov_shorten((struct iovec *)from->iov, from->nr_segs, count);
write_len = iov_length(iov, *nr_segs);
write_len = iov_length(from->iov, from->nr_segs);
end = (pos + write_len - 1) >> PAGE_CACHE_SHIFT;
written = filemap_write_and_wait_range(mapping, pos, pos + write_len - 1);
@ -2426,7 +2425,7 @@ generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
}
}
written = mapping->a_ops->direct_IO(WRITE, iocb, iov, pos, *nr_segs);
written = mapping->a_ops->direct_IO(WRITE, iocb, from->iov, pos, from->nr_segs);
/*
* Finally, try again to invalidate clean pages which might have been
@ -2443,6 +2442,7 @@ generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
if (written > 0) {
pos += written;
iov_iter_advance(from, written);
if (pos > i_size_read(inode) && !S_ISBLK(inode->i_mode)) {
i_size_write(inode, pos);
mark_inode_dirty(inode);
@ -2645,11 +2645,10 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (unlikely(file->f_flags & O_DIRECT)) {
loff_t endbyte;
written = generic_file_direct_write(iocb, iov, &from.nr_segs, pos,
written = generic_file_direct_write(iocb, &from, pos,
count, ocount);
if (written < 0 || written == count)
goto out;
iov_iter_advance(&from, written);
/*
* direct-io write to a hole: fall through to buffered I/O